ON THE DIPTERA OF BAJA CALIFORNIA, INCLUD- 

 ING SOME SPECIES FROM ADJACENT REGIONS. 



•BY C. H. TYLER TOWNSEND. 



The material described and identified in the following 

 pages, which is mostly from the very interesting region 

 of Lower California, was sent to me for study by the 

 California Academy of Sciences. Type specimens of all 

 the new species herein described are contained in the 

 collection of the Academy. Most of the material was 

 collected by Dr. Gustav Eisen, the remainder having been 

 secured by Mr. Chas. D. Haines and others. 



Some very interesting forms were found in the Lower 

 California material, of which perhaps the most impor- 

 tant are four species of Rhaphiomidas, while the whole is 

 of much interest as coming from a region which is hardly 

 known as yet dipterologically. 



SIMULIDyE. 



1. SiMULiuM ciNEREUM Bellardi. El Taste, Cape 

 Region, Baja California (Eisen). September. Seven 

 females. These agree well with description, and are un- 

 doubtedly this species. The antennae are rather brown- 

 ish than black, however; and the thorax is often more or 

 less rufous on dorsum. 



BIBIONID^. 



2. DiLOPHUs STYGius Say. Compl. Wr. ii, 352. San 

 Jose del Cabo, Baja California (Eisen). October. Thir- 

 teen females. El Taste, Baja California (Eisen). Sep- 

 tember. Eight females and six males. The females 

 agree with Say's description, and I beheve should be 

 referred to this species. The males are smaller, with 

 much smaller wings in proportion, and the wings are 

 whitish except the small black stigma. The female is 



2d Ser., Vol. IV. April 8, 1895. 



